On the other hand, if you have your own album art images in your collection (as "cover.jpg" in the album folders of the collection), Jaangle will use your album art "cover.jpg" images when displaying those albums and playing songs from those albums.

So if you've taken the trouble to develop your own album art (e.g. high-quality, either scanned/edited yourself or retrieved/resized from some high-quality web source) , Jaangle will not have to download its own. It will use yours.